8.4V / 0.45A heater for series-string TV receiver heater chains. Electrically identical to EL84/6BQ5 in all other respects.
Not interchangeable with EL84/6BQ5 without heater circuit modification.
Brans Vademecum lists equivalents: 16GK6, 29GK6, 6BQ5, 6GK6, 6P15, 7189A, 8GK6, EL172, EL20, EL22, EL84 — many of these have different heater voltages and are not direct drop-in replacements.
Pin Layout — Noval
1Internal Connection
2Control Grid (g1)
3Cathode (g3 internally connected)
Socket-Compatible Tubes ⚠ Not electrically compatible